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You can whiten concrete for unsealed and unfinished concrete with a solution or either muriatic acid or bleach and water—but never both. However, if your concrete does have a stain, finish, or polish, keep in mind that these hard chemicals could damage the topcoat. Your best bet otherwise is to power wash outdoor concrete slabs or clean indoor ones with a gentle cleaner such as laundry or dish detergent.

If your concrete stains are green in color, it indicates the presence of mold or algae—which you should address right away. If left unattended, mold will spread to other areas throughout the home. However, be careful not to disturb mold on indoor concrete surfaces and work with a local mold remediation specialist for specialized care. Once free from mold and algae, seal your concrete to eliminate pores and gaps.

The lifespan of stained concrete can range from five years to a lifetime, depending on the type of stain used and how well it is maintained. Acid-based stains penetrate the concrete and can last 20 years or more, while water-based stains are less durable and may last around five years, especially on outdoor surfaces exposed to UV light and weather. To preserve the color and extend the life of the finish, stained concrete should be properly sealed and then resealed every three to five years. Factors like foot traffic, climate, and proper initial application also affect its longevity.

Outdoor kitchens get wet and are sometimes next to pools. To avoid accidents, go with a non-slip material like concrete, brick, or rubber. Avoid materials like ceramic and porcelain, as they are known to be quite slippery. Wood and composite flooring can be slippery if untreated, so make sure to stain or finish these materials.